Recall that Matter can be categorized as a single or variable composition.
• Matter is considered a pure substance if it is composed of a single entity. Pure substances can be further categorized into two:
▪ Element → cannot be separated into simpler substances or composed of only 1 type of atom (eg. O3, Cl2)
▪ Compound → can be separated into simpler substances
• Matter is considered a mixture if they have variable composition. Mixtures are not chemically combined. Mixtures can be further categorized into two:
When hydrogen and oxygen combine to form water, they form:
A) an unstable compound
B) a stable mixture
C) an unstable mixture
D) an extremely stable compound
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